640520416330 has 16 divisors (see below), whose sum is σ = 1154245433544. Its totient is φ = 255917347840.

The previous prime is 640520416301. The next prime is 640520416331. The reversal of 640520416330 is 33614025046.

It can be written as a sum of positive squares in 4 ways, for example, as 235379255281 + 405141161049 = 485159^2 + 636507^2 .

It is not an unprimeable number, because it can be changed into a prime (640520416331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36343087 + ... + 36360706.

Almost surely, 2^640520416330 is an apocalyptic number.

640520416330 is a deficient number, since it is larger than the sum of its proper divisors (513725017214).

640520416330 is a wasteful number, since it uses less digits than its factorization.

640520416330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72704681.

The product of its (nonzero) digits is 51840, while the sum is 34.

The spelling of 640520416330 in words is "six hundred forty billion, five hundred twenty million, four hundred sixteen thousand, three hundred thirty".